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Knowledge Base

VRRP Switchover of AR46 Router Fails because of Configuration of Port Mirroring of Device

Publication Date:  2012-07-27  |   Views:  2  |   Downloads:  0  |   Author:  Zhu Meihua  |   Document ID:  EKB0000203217


Issue Description

Two AR46-80 routers are connected through 29XX switch of C corporation. AR46-80-1 router connects 2 port of 29XX switch. AR46-80-2 router connects 3 port of 29XX switch. Two AR46-80 routers enable VRRP and they are in the same VRRP backup group. Test VRRP and it is found that VRRP switchover fails and there is much VRRP alarm.

Alarm Information

VRRP alarm on two AR46-80 routers are as follows:
Duplicate IP address 136.12.X.3, sent from ethernet address: 0000-5X00-0X05   
Duplicate IP address 136.12.X.3, sent from ethernet address: 0000-5X00-0X05                                              Duplicate IP address 136.12.X.3, sent from ethernet address: 0000-5X00-0X05                                              Duplicate IP address 136.12.X.3, sent from ethernet address: 0000-5X00-0X05   

Handling Process

1、Check data configuration on two AR46-80 routers and it is not problematic.
2、Check VRRP debugging information on two AR46-80 routers. AR46-80-1 router can receive VRRP packet of AR46-80-2 router, but AR46-80-2 router cannot receive  VRRP packet of AR46-80-1 router.
3、 Check data configuration of 29XX switch of C corporation. Mirroring is set from 2 port to 1 port. Connect 1 port of 29XX switch with  one PC and capture packet. It can capture VRRP packet sent between two AR46-80 routers and VRRP switchover succeeds.  Disconnect PC and 1 port of 29XX switch, VRRP switchover fails and there is much VRRP alarm on two AR46-80 routers. 
4、Delete mirroring configuration on 2 port of 29XX switch of C corporation and VRRP switchover is normal. There is no VRRP alarm.

Root Cause

From VRRP alarm on two AR46 routers, possible reasons of VRRP switchover failure are:
1、Data conciguration of AR46-80 router is problematic.
2、 Data configuration of 29XX switch of C corporation is not correct or it is abnormal.


VRRP switchover fails, check configuration of idevice of nternal network.